﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.IO;
using System.Collections;
using System.Collections.Specialized;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace SYcwpb.Helpers
{
        /// <summary>
    /// IniFiles类
    /// </summary>
    public class IniFileHelper
    {

        //声明读写INI文件的API函数
        [DllImport("kernel32")]
        private static extern bool WritePrivateProfileString(string section, string key, string val, string filePath);

        [DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string section, string key, string def, byte[] retVal, int size, string filePath);

        private string FileName; //INI文件名

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="AFileName">文件路径</param>
        public IniFileHelper(string filePath)
        {
            string path = Application.StartupPath + "\\" +  filePath;

            FileInfo fileInfo = new FileInfo(path);// 判断文件是否存在

            if ((!fileInfo.Exists))
            {
                using (StreamWriter sw = new StreamWriter(path, false, System.Text.Encoding.Default))
                {
                    try
                    {
                        sw.Write("#表格配置档案,请不要修改文件内容!");
                        sw.Close();
                    }
                    catch
                    {
                        throw (new ApplicationException("Ini文件不存在"));
                    }
                }
            }
            //必须是完全路径，不能是相对路径
            FileName = fileInfo.FullName;
        }

        /// <summary>
        /// 写文本数据
        /// </summary>
        /// <param name="Section">根节点</param>
        /// <param name="Ident">节点名</param>
        /// <param name="Value">默认值</param>
        public void WriteString(string Section, string Ident, string Value)
        {
            if (!WritePrivateProfileString(Section, Ident, Value, FileName))
            {

                throw (new ApplicationException("写Ini文件出错"));
            }
        }

        /// <summary>
        /// 读取文本字段
        /// </summary>
        /// <param name="Section">根节点名</param>
        /// <param name="Ident">节点名</param>
        /// <param name="Default">默认值</param>
        /// <returns>文本结果</returns>
        public string ReadString(string Section, string Ident, string Default)
        {
            Byte[] Buffer = new Byte[65535];
            int bufLen = GetPrivateProfileString(Section, Ident, Default, Buffer, Buffer.GetUpperBound(0), FileName) ;
            //必须设定0（系统默认的代码页）的编码方式，否则无法支持中文
            string s = Encoding.GetEncoding(0).GetString(Buffer);
            int n = 0;
            for (int i = 0; i < bufLen ; i++)
            {
                if (Buffer[i] > 128)
                    n++;
            }
            s = s.Substring(0, bufLen - n / 2);    //在UNcodexitong中中文算一个字符
            return s.Trim();
        }

        /// <summary>
        /// 读整数字段
        /// </summary>
        /// <param name="Section">根节点名</param>
        /// <param name="Ident">节点名</param>
        /// <param name="Default">默认值</param>
        /// <returns>整数结果</returns>
        public int ReadInteger(string Section, string Ident, int Default)
        {
            string intStr = ReadString(Section, Ident, Convert.ToString(Default));
            try
            {
                return Convert.ToInt32(intStr);

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return Default;
            }
        }

        /// <summary>
        /// 写整数
        /// </summary>
        /// <param name="Section">根节点名</param>
        /// <param name="Ident">节点名</param>
        /// <param name="Value">节点值</param>
        public void WriteInteger(string Section, string Ident, int Value)
        {
            WriteString(Section, Ident, Value.ToString());
        }

        /// <summary>
        /// 读布尔
        /// </summary>
        /// <param name="Section">根节点名</param>
        /// <param name="Ident">节点名</param>
        /// <param name="Default">默认值</param>
        /// <returns>返回布尔值</returns>
        public bool ReadBool(string Section, string Ident, bool Default)
        {
            try
            {
                return Convert.ToBoolean(ReadString(Section, Ident, Convert.ToString(Default)));
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return Default;
            }
        }

        /// <summary>
        /// 写布尔值
        /// </summary>
        /// <param name="Section">根节点名</param>
        /// <param name="Ident">节点名</param>
        /// <param name="Value">布尔值</param>
        public void WriteBool(string Section, string Ident, bool Value)
        {
            WriteString(Section, Ident, Convert.ToString(Value));
        }

        /// <summary>
        /// 读取根节点的所有节点名
        /// </summary>
        /// <param name="Section">根节点名</param>
        /// <param name="Idents">字符串集合</param>
        public void ReadSection(string Section, StringCollection Idents)
        {
            Byte[] Buffer = new Byte[16384];
            //Idents.Clear();

            int bufLen = GetPrivateProfileString(Section, null, null, Buffer, Buffer.GetUpperBound(0),
             FileName);
            //对Section进行解析
            GetStringsFromBuffer(Buffer, bufLen, Idents);//从Ini文件中，将指定的Section名称中的所有Ident添加到列表中
        }

        private static void GetStringsFromBuffer(Byte[] Buffer, int bufLen, StringCollection Strings)
        {
            Strings.Clear();
            if (bufLen != 0)
            {
                int start = 0;
                for (int i = 0; i < bufLen; i++)
                {
                    if ((Buffer[i] == 0) && ((i - start) > 0))
                    {
                        String s = Encoding.GetEncoding(0).GetString(Buffer, start, i - start);
                        Strings.Add(s);
                        start = i + 1;
                    }
                }
            }
        }

        /// <summary>
        /// 从Ini文件中，读取所有的Sections的名称
        /// </summary>
        /// <param name="SectionList"></param>
        public void ReadSections(StringCollection SectionList)
        {
            //Note:必须得用Bytes来实现，StringBuilder只能取到第一个Section
            byte[] Buffer = new byte[65535];
            int bufLen = GetPrivateProfileString(null, null, null, Buffer, Buffer.GetUpperBound(0), FileName);
            GetStringsFromBuffer(Buffer, bufLen, SectionList);
        }

        /// <summary>
        /// 读取指定的Section的所有Value到列表中
        /// </summary>
        /// <param name="Section"></param>
        /// <param name="Values"></param>
        public void ReadSectionValues(string Section, NameValueCollection Values)
        {
            StringCollection KeyList = new StringCollection();
            ReadSection(Section, KeyList);
            Values.Clear();
            foreach (string key in KeyList)
            {
                Values.Add(key, ReadString(Section, key, ""));

            }
        }


        public void EraseSection(string Section)
        {
            //
            if (!WritePrivateProfileString(Section, null, null, FileName))
            {

                throw (new ApplicationException("无法清除Ini文件中的Section"));
            }
        }

        //删除某个Section下的键
        public void DeleteKey(string Section, string Ident)
        {
            WritePrivateProfileString(Section, Ident, null, FileName);
        }


        public void UpdateFile()
        {
            WritePrivateProfileString(null, null, null, FileName);
        }

        //检查某个Section下的某个键值是否存在
        public bool ValueExists(string Section, string Ident)
        {
            //
            StringCollection Idents = new StringCollection();
            ReadSection(Section, Idents);
            return Idents.IndexOf(Ident) > -1;
        }

        //确保资源的释放
        ~IniFileHelper()
        {
            UpdateFile();
        }
    }
}
